The Reds are faced with the unusual situation of still not knowing where we will be playing in a few days' time due to the postponement of Tranmere Rovers and Watford's replay, as the Prenton Park pitch was waterlogged on 14 January.
The two sides drew 3-3 at Vicarage Road in the first tie, with League One outfit Tranmere bravely battling back from three goals down at the interval.
Watford were in Premier League action on Tuesday night and lost to an injury-time winner at Aston Villa, so their manager Nigel Pearson looks certain to rotate his squad for this evening's FA Cup replay.